Input energy control by electron beam diode in intense pulse power generator

Summary form only given. Accurate property information of matter is required for evaluating inertial confinement fusion (ICF) with the implosion timescale. In particular, warm dense matter (WDM) is the complex regime, because of unclear theoretical models and lacked experimental evaluations. To understand the properties of matter, an evaluation method for WDM should be established. The purpose of this study is to measure the state of matter with similar timescale of the ICF implosion process. An intense pulse power generator ETIGO-II is used to generate the state of matter.1 The isochoric heating using pulsed power discharge method is applied.2 To control the input energy provided by ETIGO-II into the sample, we propose using the electron beam diode. The electron beam diode, which consists of a plane disc cathode and a mesh anode, is used as an adjustable resistance in the pulsed power system. The electron beam current and the impedance are decided by the electrode gap distance. The input energy into the sample depends on the impedance, because the sample resistance, in which is the foamed metal, is small. We measured the input energy by the voltage and current waveforms experimentally, and the equivalent circuit model indicated that the input energy is controllable by the electron beam diode to adjust the distance of the diode gap.